Abstract
The spontaneous unimolecular dissociation reactions of the molecular ions of ortho-, meta- and para-acetylanisoles have been investigated by mass-analyzed ion kinetic energy spectrometry, high resolution mass spectrometry and deuterium labelling. Losses of CH 3 . from the molecular ions of all isomers occur exclusively from the acetyl group. The loss of CH 3 . for the o-isomer consists of two processes, i.e. one of them is a simple cleavage, and the other is a rearrangement. The latter is not observed for the m- and p-isomers. The loss of H 2O from the molecular ion is also unique for the o-isomer, and the fragmentation mechanism is also explored.
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